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input acoustic impedance 声输入阻抗
Negative coefficients occur where there is a decrease in acoustic impedance across the reflecting interface. 当反射界面上下两侧的声波组抗降低时，反射系数就会出现负值。
Methods To check on objective acoustic impedance and subjective pure tone audiometry. 方法对外伤性聋进行客观声导抗测试和主观纯音测试。
And the fluid micro-annulus does not affect the shape of spectra, but its existence is equivalent to lowering the acoustic impedance of the cement. 水泥胶结类型不同，反射谱的特征亦不同；微环的存在相当于水泥环声阻抗变小，基本不影响反射谱的形态。
Opposition to the flow of sound through a surface,acoustic resistance is the real component of acoustic impedance and acoustic reactance is the imaginary component. 声音在通过一个表面时受到的阻力，声阻是声阻抗的实部，声抗是声阻抗的虚部。
It is difficult for conventional reflection seismic surveys to get the information of low velocity layers underlain high acoustic impedance layers, such as evaporites and basalts. 在蒸发岩、玄武岩等高阻抗岩层发育地区，常规反射地震往往难以获取高阻抗层以下的地层地质信息。
Obviously, this combined application of AVO attribute analysis and poststack acoustic impedance inversion can effectively identified gas reservoirs in the study area. 综合应用AVO属性分析及叠后波阻抗反演技术可以有效识别研究区气层;
It was found that confineme n t expands significantly the duration of shock waves,and the peak pressure of sho ck waves enhances with its acoustic impedance. 实验发现，约束层对激光冲击波的脉宽有显著的展宽作用，且冲击波的峰压值随约束层材料的声阻抗的增大而增大。
The influence of one-dimension compressible bias flow on the acoustic impedance of perforated panels was discussed with consideration of the compressibility of flow. 摘要从理论上研究了一维可压缩偏流对穿孔声阻抗率的影响，并分析了偏流对穿孔粘滞效应的影响；
Piezoelectric and dielectric properties and acoustic impedance of the composites with different strontium ferrite and barium ferrate contents were measured and investigated. 分析讨论锶铁氧体和钡铁氧体掺杂质量分数对压电复合材料压电性能、介电性能及声阻抗的影响。
There are some parameters that influence the multilayer microperfrated structure,which make acoustic impedance and absorption cofficient to compute complicatedly. 影响双层微穿孔结构的参数很多,其声阻抗及吸声系数的计算复杂。
On the basis of this, the well restrained inverse acoustic impedance and instantaneous frequency are jointly used to predict the overpressure of Yangxia sag, Kuche depression. 在此基础上，利用井约束反演的波阻抗与瞬时频率联合对库车坳陷阳霞凹陷内的超压带进行了预测。
There are some parameters that influence the multilayer microperfrated structure, which make acoustic impedance and absorption cofficient to compute complicatedly. 摘要影响双层微穿孔结构的参数很多，其声阻抗及吸声系数的计算复杂。
As an objective diagnostic method, aural acoustic impedance measuring device holds a very important position in diagnosing ear diseases and hearing obstacles. 作为一种客观的诊断方法,耳声阻抗测量仪在临床耳疾和听力障碍诊断方面具有重要地位。
According to the acoustic impedance curve of stapedius, we proposed a mathematical model of the ipsilateral acoustic reflex using the methods of cybernetics. 针对镫骨肌声反射的声阻抗变化曲线,采用控制论的方法,对同侧声反射进行了数学建模。
When a wave emanating from the surface reaches a boundary between two media that have different acoustic impedance (the product of density and velocity), some of the energy is reflected back into the upper medium. 当一个从地面激发的波动到达具有不同声波组抗（速度与密度之乘积）的两种介质之间的分间面时，其部分能量将被反射并回到上覆介质中。
The authors use the specific acoustic impedance of MPP which needs to be measured beforehand in the approach, and then, the transfer matrix method is employed to predict the sound-absorbing performance of single or multi-layered MPP. 采用该方法获得的微孔板吸声性能曲线与实测结果相当接近，能较好地预测各种组合微孔板的吸声性能。
The examined cement specimens were cast according to the national standard,and the acoustic impedance and compressive strength of the specimens after curing for 24 hours were measured. 按国家标准浇铸油井水泥试块,养护24h后测其声阻抗及抗压强度。
Those infants who failed the audiometry had to receive comprehensive examinations such as acoustic impedance audiometry(AIA), otoacoustic emission(OAE), auditory brainstem response(ABR) and auditory steady-state response(ASSR). 对未通过者进行声阻抗、耳声发射、听性脑干反应、听觉稳态诱发反应的全面综合检查以确定听力损失的性质和程度。
In this paper, we establish the interferometric hydrophones.The fiber optic coil of the sensor head is embedded with the special materials in order to acoustic impedance matching and waterproofing. 中文摘要由于声波能在水中做长距离的传播，使得水中听音器在水下侦测方面一直扮演著关键性的角色。